Sofia’s buses are in the process of modernising with Oyster
card type scanners, but previously you had to buy a book of tickets. For each
journey you stamped one in a kind of hole punch that was mounted at head
height. The tickets were numbered so that if inspectors got on, they could
check your stamped ticket against those left in your book to make sure it was
in sequence. You would always see some tickets left on seats for others to use
- these were the final tickets from books which meant that inspectors couldn’t
check them for verification.
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